superkaz661- Welcome to Autopia!
While I do prefer the
flex plates, sorta out of general priciples, most of mine aren't all *that* flexible anyhow- *Including* the one you wanted. By the time I put enough pressure on them to really make 'em
flex, I've overloaded the PC's abilities and made it merely "jiggle".
I never had any issues from using the rigid ones.
I'd keep the Edge plate, and buy the
flex one too. It really does pay to have a backup, and when you have both on-hand I think you'll see that the flex feature doesn't amount to all *that* much, functionally speaking. You'll probably still like it better though, I know I do
I predict that you'll find the PC *so* gentle that any worries will quickly be forgotten. Before too long you'll probably be back asking how to make it more aggressive

(And the answer is: with a small backing plate and 4" pads.)